Device for securing armature-coils.



P. KENNEDY & J. A. MISLAND. DEVICE FOR SECURING ARMATUR-E GOILS.

APPLICATION FILED FEB. 8, 1911.

Patented Jan. 12, 1915.

ATTORNEY WITNESSES: 63%. p61 flaw/a 1o ful PATRICK KENNEDY, OF BROOKLYN,

YONNE, ,NEw JERSEY, ASSIGNORS AND EQUIPMENT COMPANY, OF

NEW YORK, AND JOSEPH A. MISLAND, 01? IRA- TO CONSOLIDATED RAILWAY ELECTRIC LIGHTING NEW YORK, N. Y., A CORPORATION OF MAINE.

DEVICE FOR SECURING ABMATUBE-GOILS.

Specification of Letters Patent.

Patented Jan. 12, 1915.

Application filed February 8, 1911. Serial No. 607,337.

To all whom it may concern Be it known that we, PATRICK Knnnnor, a citizen of the United States, whose residence and post-oilice address is 17 7 Putnam avenue, Brooklyn, New York, and JOSEPH A. MISLAND, a citizen of'the United States, whose residence and post-office address is 97 West Thirty-third street, Bayonne, New Jersey, have invented certain new and use- Improvements in Devices for Securing Armature-Coils; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to an improvement in devices for securing armature coils in dynamo electric machines to prevent any movement of the coils relative to the armature core, and more particularly at their ends where the coils project outside the core slots.

It has been found in practice that as a result of continued vibration and magnetic loose and bend out of 'efiects, the armature coils gradually work place until they project outside the periphery of the armature core and strike the pole pieces of the field magnets, or rub through their insulation at places of contact. In order to avoid such occurrence, it has heretofore been customary to secure the armature coils by acircular wrapping of wire, the ends of which were soldered together. However, if one of the strands of such a wrapping breaks, or if the solder is melted by excessive heat developed in the armature from any cause, the loosened strand is free to fly out tangentially and create short circuits and mechanical troubles which may well destroy the machine. Furthermore the breaking of a single strand is "cry likely to result in the complete tearing oif of the entire wrapping, and the consequent loosening of the armature coils. These conditions are more likely to occur in the case of machines which are connected to the axles of railway cars for the purpose of train lightin or in analogous cases, as the dynamo is t on subjected to excesslve vi- 'bration, shock and speed variation and furthermore must be inclos'ed to protect it from dirt and water and must be mounted in a comparatively inaccessible place. Thorough inspection of the dynamo is very infrequent and any loosening of the armature coils or bands or any chatting of insulation is likely to progress until electrical 'difiiculties develop and interrupt the service. In accordance with my present invention these difliculties are obviated by mechanically holding the ends of the armature coils in fixed position by means of a circular wrapping of wire held together by specially formed clamps at regular intervals around the circumference of the band or wrapping.

In the accompanying drawings forming a part ofthe specification, Figure 1 is a longitudinal view of the armature, partly in section; Fig. 2 is a perspective view of the band wire clamp, being partly broken away so as to show the ends of the binding wire twisted around the clamp studs; Fig. 3 is a front elevation of the clamp with the band wire in section; Fig. 4 is an end view of the armature, showing in further detail the arran ement of the bindin wire clam )S and the slot wedges relative to the armature coils; Fig. 5 is a plan view of the band wire clamp showing one stud compressed and the other not compressed; Fig. 6 is a sectional elevation of the band wire clamp corresponding to Fig.

Referring more particularly to the parts, 1 is the armature core, 4 the commutator, the armature coils, 6 the slot wedges, and 7 the binding wire. A shell 9 supports the ends of the armature coils and also holds the armature core laminations in place through the aid of the bolts 10 and the ring 11 screwed on the shaft 2. In accordance with United States Letters Patent No. 980,286 granted to us on January 3, 1911, a metal-wedge 6 is inserted in a dove-tail recess in the armature core teeth and then se curely locked therein by enlarging the openings in the wedge from an elongated shape to one of circular form. In this way the coils are prevented from any-radial movement and the wedges are prevented from longitudinal movement.

In addition to securing the armature coils in the core slots, it has been found expedient to further secure the coils where they project beyond the ends of the core. In accordance with our present invention this is accomplished by winding around the projecting coils a number of turns of binding wire, 7, which prevents them from spreading and hand side of Fig. 6. The'top bar is then forced down on the band wires by upsetting ,the heads of the rivets or the ends of the f-istuds, as shown on the left hand side of Fig.

from any radial movement, and then permanently fastening the binding wires together by metal clamps 8, spaced regularly around the'circumference. The'clamp 8 is made of any: suitable metal, such as brass, and preferably-consists of two bars 12 and 13, each having a hole near either end. The bar 13,

on which sets the turns of binding wire, carries a hollow stud or rivet 14:, projecting upwardly from each hole. The studs may be fastened to the bar by compression, by

upsetting their ends, by solder, or by any;

other suitable means, or maybe integral therewith. After the band wires completely fill the space between the studs, the other bar is set inplace so that the studs extend through its openings, as shown on the right '6,;; Fig. 3 shows, the finished clamp. Instead strand, and rendering unnecessary the use of 7 Any material solder which easily melts. circumferential movement of the band is arrested by interference between the clamps and the armature coils, while longitudinal movement of-the'band is prevented by depression of the armature coils at the place where the band is wound around. The ends of the binding wire are twisted around the studs of the clamp, as shown in Fig. 2.

What we claim and desire to secure by Letters Patent of the United States is:

1. A coil-binding means for armatures of dynamo-electric machines, comprising a circumferential wrapping of wire in a number of strands around the armature coils, a plu- 'rality of underlying clamp barsover which the wrapping is wound, and cooperatin clamp bars overlying the said strands and secured to the underlying bars and restraining the strands from relative circumferential movement, substantially as described.

2'. A coil-binding means for armatures ofdynamo-electric machines, comprising a circumferential wrapping of wire in a number of strands around the armature coils, a plurality of underlying clamp bars positioned between adjacent coilsand over which the wrapping is'wound and cooperating clamp bars overlying the said strands and riveted to the underlying bars to restrain the strands from relative circumferential movement, the ends of the wrapping wire being secured to the rivets, substantially as described.

In testimony whereof we affix our signatures, in presence of two witnesses.

PATRICK KENNEDY.

JOSEPH A.

Witnesses:

LEON W. ROSENTHAL, WILLIAM H. DAVIS. 

